/Engine/Plugins/Developer/Concert/ConcertMain/Source/Concert/Public/IConcertSession.h
Send a custom event event to the given endpoints
template<typename EventType> void SendCustomEvent ( const EventType & Event, const [TArray](API\Runtime\Core\Containers\TArray)< [FGuid](API\Runtime\Core\Misc\FGuid) > & DestinationEndpointIds, [EConcertMessageFlags](API\Plugins\ConcertTransport\EConcertMessageFlags) Flags, [TOptional](API\Runtime\Core\IO\TOptional)< [FConcertSequencedCustomEvent](API\Plugins\Concert\FConcertSequencedCustomEvent) > SequencedId )